Welcome to Scimitar ownership The previous owner ran my 5a on Castrol Classic 20w50 and I've been running it on Halfords 20w50 along with the MANN W916/1 filter from Graham Walker for the last six years without any trouble. I've used Castrol EP 80w-90 GL4 for the axle.

Lumenition ignition has worked fine for me.

Aswell as replacing the fuel lines its wise to check the fuel line has had the small pin added where the brass tube enters the carb, a Reliant recall, these tubes had a habit of sliding out!